Hugh Brasher, CEO of London Marathon Events, said: "The 2027 TCS London Marathon Double is our most ambitious evolution to date – a once-in-a-generation one-time-only reimagining of what a marathon and city-wide celebration of activity can be."
He highlighted that the expanded field aims to maximize the event's social and financial impact across the United Kingdom.
"By expanding to 100,000 runners across two days, we’re opening the door for more people, more charities and more communities to take part in the world’s greatest marathon," Brasher added.
Mayor of London Sadiq Khan endorsed the expansion, stating: "London is the sporting capital of the world and I am delighted that, for one year only in 2027, the world famous TCS London Marathon will expand into a two-day event."
Khan emphasized the philanthropic scale: "This unique, one-off double will allow a record 100,000 participants to take part across the two days – creating the largest fundraising moment in UK sporting history."
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City management teams are coordinating logistical operations to accommodate the expanded infrastructure requirements. Ballot applicants will receive official notifications in early July.
